 OS free is think of it like git but for your operating systems. So when a package maintainer or whenever a maintainer commits something, they actually package the entire thing under one hash. And every time you upgrade, you upgrade to that particular hash. So if something is failing, let's imagine a particular hash that we all are sitting in. And there is a very high chance if my Firefox crashes, your Firefox will crash as well. Because we are sitting on one simple hash. And which means if I were to fix something and deliver you a fix, it is very easy for me to tell you, OK, that hash works. Just upgrade it. And it would just solve your problem. That's a very simple way to detect problems and fix it or rather try to find a root cause of it without going into what packages changed